package com.sky.service.impl;

import com.fasterxml.jackson.databind.ser.Serializers;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        //进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工的方法
     * @param employeeDTO
     */
    public void save(EmployeeDTO employeeDTO) {
        //next we transfer the DTO to the java entity for the convenience for using the mapper layers
        Employee employee = new Employee();
        //Since the name of the Employee and the employeeDTO are the same, we don't need to do this one by one
        //对象的属性拷贝
        BeanUtils.copyProperties(employeeDTO,employee);// from the front to the back, notice the direction and the same name
        employee.setStatus(StatusConstant.ENABLE); //avoid the using of hard-coding, more standardized
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());

        //the createUser and the updateUser cannot be set now!
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());

        //use the mapper layers to insert the data
        employeeMapper.insert(employee);
    }

    @Override
    public PageResult query(EmployeePageQueryDTO employeePageQueryDTO) {
        //pageHelper会自动把limit分页的参数自动计算 拼接到mapper的sql语句中
        PageHelper.startPage(employeePageQueryDTO.getPage(),employeePageQueryDTO.getPageSize());
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);
        long total = page.getTotal();
        List<Employee> records = page.getResult();
        return new PageResult(total,records);
    }

    /**
     * 设置员工的状态信息 1为启用 0为禁用
     * @param status
     * @param id
     * @return
     */
    @Override
    public void SetStatus(Integer status, Long id) {
        //update employee set status = ? where id = ?
        //可以直接仅修改这两个 但是如果设置一个Employee对象 进行动态更新 这样的sql语句适用性会更强
        //写法1
//        Employee employee = new Employee();
//        employee.setId(id);
//        employee.setStatus(status);
        //写法2 由于类Employee上有@Builder注解 所以有别的方法
        Employee employee = Employee.builder().status(status).id(id).build();
        employeeMapper.update(employee);
    }

    /**
     * 根据员工的id进行信息查询
     * @param id
     * @return
     */
    public Employee queryById(Long id) {
        Employee employee = employeeMapper.queryById(id);
        //除了在employee中使用@JsonIgnore注解 也可以用如下办法
//        employee.setPassword("****");
        return employee;
    }

    /**
     * 保存员工的信息
     * @param employeeDTO
     * @return
     */
    @Override
    public void UpdateInfo(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }
}
